libstdc++-v3/testsuite/experimental/memory/observer_ptr/cons/cons.cc

   1 // { dg-do run { target c++14 } }
   2
   3 // Copyright (C) 2015-2024 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <experimental/memory>
  21 #include <testsuite_hooks.h>
  22 #include <utility>
  23
  24 using std::experimental::observer_ptr;
  25
  26 struct B {};
  27 struct D : B {};
  28
  29 void test01()
  30 {
  31   observer_ptr<int> a;
  32   VERIFY(!a);
  33   observer_ptr<int> b{nullptr};
  34   VERIFY(!b);
  35 }
  36
  37 void test02()
  38 {
  39   int x{};
  40   observer_ptr<int> a{&x};
  41   observer_ptr<int> b{a};
  42   VERIFY(a == b);
  43 }
  44
  45 void test03()
  46 {
  47   observer_ptr<int> a;
  48   observer_ptr<const int> b{a};
  49   VERIFY(a == b);
  50 }
  51
  52 void test04()
  53 {
  54   D x{};
  55   observer_ptr<D> a{&x};
  56   observer_ptr<B> b{a};
  57   VERIFY(a == b);
  58 }
  59
  60 void test05()
  61 {
  62   D x{};
  63   observer_ptr<D> a{&x};
  64   observer_ptr<B> b{std::move(a)};
  65   VERIFY(a == b);
  66 }
  67
  68 void test06()
  69 {
  70   static constexpr D x{};
  71   constexpr observer_ptr<const D> a{&x};
  72   constexpr observer_ptr<const B> b{std::move(a)};
  73   VERIFY(a == b);
  74   constexpr observer_ptr<const B> c{a};
  75   VERIFY(a == b && a == c && b == c);
  76   constexpr observer_ptr<int> d;
  77   constexpr observer_ptr<int> e{nullptr};
  78   VERIFY(!d);
  79   VERIFY(!e);
  80 }
  81
  82 int main()
  83 {
  84   test01();
  85   test02();
  86   test03();
  87   test04();
  88   test05();
  89   test06();
  90 }